Lassgard Bioteknik was an aquaculture company headquartered in Uppsala, Sweden. Founded out of Uppsala Science Park in 2021, the company’s research and development was focused on using genetic modification and full-cycle farming to replenish depleted fish stock. At its peak, Lassgard Bioteknik operated a fully integrated value chain across five countries and covered seven endangered and extinct species, including Atlantic halibut, Atlantic salmon, and red sea bream.
In 2034, Lassgard Bioteknik introduced a line of Atlantic bluefin tuna that became increasingly popular in the Asian seafood market and accounted for roughly 80% of worldwide tuna consumption by 2039. It was then revealed that the company’s feeding practices for this line of tuna were the most likely origin of Cariappa-Muren disease (CMD), which has claimed close to 40,000 lives since it was discovered.
As a result of the mass consternation surrounding the CMD pandemic and the public implication of Lassgard Bioteknik, multiple lawsuits were filed against president and chief executive officer (CEO) William Lassgard in late 2039. After he disappeared on October 29th 2039, his board and creditors were forced to manage liquidation proceedings.
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Lassgard Bioteknik was founded on August 5th 2021 in Uppsala, Sweden by William Lassgard, whose research project at the Uppsala Science Park had resulted in the development of a genetically engineered Atlantic halibut. By then categorised as a critically endangered species, the Atlantic halibut had a relatively slow growth and late onset of sexual maturity, at seven years for males and ten for females at the earliest. Lassgard had managed to increase the growth rate of his Atlantic halibut to an average of two and a half years for males and three for females, making it a candidate for full-cycle fish farming.
After receiving approval from the Swedish National Food Agency (NFA) in October 2021, Lassgard raised ¥26.2 million in a public offering of shares and an additional ¥7.5 million via crowdfunding for the installation of recirculating aquaculture systems in two warehouses outside Uppsala. In 2024, Lassgard Bioteknik made its first sale of 2.5 tonnes of adult-sized Lassgard halibut after it had already begun selling eggs and juveniles to commercial fisheries and grow-out farms in other countries. 
While the first generation of Lassgard halibut was being raised, research continued on genetically adapting and preparing other fish species for full-cycle aquaculture, including Atlantic salmon, red sea bream, and Indian mackerel. Lassgard, who had taken on the role of chief executive officer (CEO), made no secret of the fact that these fish species were all prized in the Asian seafood market, which had grown to represent close to 70% of global fish consumption by 2025.  In August 2025, Lassgard Bioteknik announced that it had successfully developed a hybrid Atlantic bluefin tuna by adding two genes from the skipjack tuna, allowing the hybrid species to spawn throughout the year and grow to market size and sexual maturity in two to three years.
To combine its Lassgard tuna with full-cycle aquaculture and bolster its overall operational capacity, Lassgard Bioteknik bought out the multinational TRANSDOTT project in September 2025.  Due to favourable logistics and short travelling distances on land, Malta had been chosen as the site for the installation of several TRANSDOTT aquaculture farms and hatcheries, but production had stalled in late 2024 after a political backlash forced Israel and Italy to pull out of the project. Lassgard Bioteknik refitted the TRANSDOTT facilities in Malta mainly for the production of Lassgard tuna. 
By 2029, Lassgard Bioteknik owned a 45% share of the global halibut market and exported over half of its entire stock to East Asia. It operated 48 land-based farming sites, 110 coastal seawater sites, four broodstock plants, and four hatcheries, all divided between Sweden and the Mediterranean. Over the following years, the company vertically integrated its supply chain and significantly expanded its operations to include Singapore, Chile, and South Africa. In 2032, the media started including Lassgard Bioteknik in the collective term Big Fish.
In early 2031, Lassgard Bioteknik was having trouble developing its tuna stock and introducing it abroad. A combination of low larvae survival rates and inadequate artificial fish meal had resulted in the company being unable to close its tuna’s aquaculture cycle. Tuna require an exceptionally large amount of food per kilogram of weight gained and the company’s vegetable and protein feeds did not meet the threshold for sustainable grow-out. Only by reappropriating part of its own farmed mackerel stock as a food source was Lassgard Bioteknik able to produce the tonnage of Lassgard tuna necessary for entry in the Asian seafood market.
After its introduction, Lassgard tuna fetched consistently low marbling grades at seafood marketplaces and was generally reviewed poorly by Asian consumers for its lacking taste. Lassgard Bioteknik quickly found itself struggling to compete with Kindai Fisheries, which had produced the first generation of full-cycle farmed Pacific bluefin tuna in 2002 and had since remained the chief supplier of farmed tuna in Japan and China with a yearly output of 35,000 tonnes by 2032. CEO Lassgard decided to go back to the drawing board and rework his company’s approach to farming its tuna, stating that he intended for Lassgard tuna to become the flagship product of Lassgard Bioteknik.
On May 11th 2034, two years to the day since the Atlantic bluefin tuna was officially declared extinct in the wild by the International Union for Conservation of Nature (IUCN) due to overfishing and anthropogenic climate change, CEO Lassgard made the announcement that his company’s researchers had developed a new artificial feed with a fat-to-protein ratio that surpassed grow-out expectations, allowing Lassgard tuna to acquire additional body fat during its aquaculture cycle. This fattening process made it an ideal choice for ōtoro sushi.
After several endorsements from renowned sushi chefs that highlighted its rich taste, the new Lassgard tuna became a prized commodity at high-end restaurants in Japan, China, and South Korea. To build on this initial foothold, Lassgard Bioteknik devoted additional production capacity in the Mediterranean to the farming of Lassgard tuna, which allowed the company to match its output with that of Kindai Fisheries by early 2037. The company responded by briefly experimenting with new artificial feeds to boost its own aquaculture stock of Kindai tuna, but was unable to challenge the Asian market’s newfound preference for fattier Lassgard tuna.
Following its success in East Asia, Lassgard tuna also became popular in specialised dining establishments in Europe and the Americas. CEO Lassgard responded by initiating the sale of residual Lassgard tuna stock to retail outlets in canned form and establishing it as an upscale consumer brand. By 2039, Lassgard Bioteknik accounted for 90% of the Asian tuna market and roughly 80% of worldwide tuna consumption.
Food poisoning scandal
In January 2039, the monthly Bulletin of the World Health Organisation (WHO) included a notice against feeding tuna to pets.  This alarm was raised on behalf of Sunil Cariappa, who earlier had discovered a possible link between an increased mortality rate in domestic cats and feeding diets that included Lassgard tuna. The WHO notice ultimately did not mention Lassgard tuna by name due to objections from the Aquaculture Advisory Council (AAC). After the notice was issued, CEO Lassgard played on his background as a biochemist to personally question the scientific validity of Cariappa’s findings.
In July 2039, Cariappa and Connie Muren had joined an Outbreak Control Team (OCT) convened by the WHO’s Global Foodborne Infections Network (GFN) and determined that Lassgard Bioteknik’s line of tuna was contaminated with a novel prion agent. This foodborne illness, which they described as piscine transmissible amyloidotic encephalopathy (PTAE), was considered to be responsible for the epizootic in cats, and further tests had demonstrated that it could be transmitted to people as well. In response, the WHO expanded the scope of the OCT, which appointed Muren as chair, and launched a bid directed at national food agencies to halt the sale of Lassgard tuna pending the team’s investigation. The AAC reacted by posting a public letter to then-WHO Director-General Yang Jinglei, stating that it would “exercise every avenue available to defeat the agenda-driven campaign against Lassgard Bioteknik and expose the dubious nature of Connie Muren’s work, including challenging the European Union’s (EU) [¥535 million] in funding to the WHO.”
To conclusively establish the origin of PTAE, the WHO requested that the Swedish Ministry of Justice subpoena Lassgard Bioteknik for all documentation pertaining to the farming process of Lassgard tuna. Lassgard Bioteknik lawyers fought the subpoena, stating that the details of this process were freely available at the Swedish Patent and Registration Office. However, it was an open secret that the information retained at the patent office was, at least in part, a fabrication. CEO Lassgard was fiercely protective of the artificial feed stock that had allowed his company’s fattier tuna to edge out the competition, and the publicly available formula for this feed was considered to be inauthentic or lacking crucial details.
While the AAC was lobbying heavily against any attempts to temporarily halt the sale of Lassgard tuna and Lassgard Bioteknik lawyers were holding up legal proceedings in Swedish courts, the company launched an aggressive marketing campaign to reassure consumers and shareholders that its tuna was safe to eat. When sales of Lassgard tuna nonetheless dipped by 2.6% during the investigation, Lassgard Bioteknik began undermining public trust in the WHO by claiming there were divisions and a lack of consensus within Muren’s OCT, giving the appearance of a scientific controversy where there was none.
On October 1st 2039, a data cache of confidential Lassgard Bioteknik documents and internal correspondence dating back to 2030 was leaked to Anse Daems, who was working on a World News Wire (WNW) story about Lassgard Bioteknik’s use of misinformation. After the source of the leak was verified, WNW asked the International Consortium of Investigative Journalists (ICIJ) for help with sorting the 11.9 million files as fast as possible, since the source had warned Daems that Lassgard Bioteknik was taking steps to conceal the PTAE outbreak in its farmed tuna, which presented a serious biorisk if left unchecked.
After the files were carefully reviewed by over 400 journalists and researchers, WNW ran a series of articles, starting on October 23rd 2039, in which it established a timeline of Lassgard Bioteknik’s malpractice and accused Big Fish as a whole of orchestrating “the most heinous misinformation campaign since climate change denial.” The articles exposed how Big Fish had come together in an informal collective defence pact to protect Lassgard Bioteknik, presumably because the entire aquaculture industry would be at risk if the PTAE outbreak was substantiated and consumers lost confidence in fish products. This pact included, among others, a misinformation campaign against Cariappa and Muren, enlisting the AAC to minimise the WHO investigation, and the funding of environmental studies in favour of farmed fish and toxicological studies that declared Lassgard tuna safe for human consumption.
Origin of contamination
As WNW was vetting the articles prior to publication, it also worked in conjunction with the GFN to provide Muren’s OCT and fifteen other laboratories with all relevant files on Lassgard Bioteknik’s tuna farming process. This allowed the team to determine that Lassgard tuna were contaminated with PTAE by their feed stock, which was not artificial fish meal as its patent described, but rather a line of in-house developed processed animal protein (PAP) pellets rendered from bovine waste material.
An official investigation with access to Lassgard Bioteknik’s facilities uncovered that the company had been purchasing this waste material at low cost from abattoirs and factory farms struggling to sell their product after the meat industry started winding down due to increased social opposition. Economic pressure, rushed deprivatisation efforts, and a lack of compensation all led to meatpackers cutting corners in their production cycles, which resulted in outbreaks of bovine spongiform encephalopathy (BSE) having a higher chance of going undetected. Muren’s OCT concluded that the PTAE epizootic in Lassgard tuna was most likely the result of an outbreak of BSE, which was passed to the tuna via the PAP pellets.
After the first BSE epidemic infected close to 500,000 cattle during the 1980s and 1990s, most countries had laid down regulations for the prevention of prion diseases in animals by prohibiting the use of PAP in feed stocks. After a consensus on the safety of feeding land animal proteins to fish in 2013, the EU had relaxed these regulations and deemed PAP suitable for use in farmed aquaculture specifically.  This exemption had motivated Lassgard Bioteknik to keep its entire infrastructure for farming Lassgard tuna in Europe instead of moving it closer to its intended market to save on shipping costs.
Timeline of cover-up
The data leak revealed that Lassgard Bioteknik had been aware as early as March 2037 that its tuna stock was exhibiting erratic behaviour due to the PTAE epizootic. At the time, the cause was attributed to the challenging nature of handling tuna in aquaculture farms. Tuna are powerful fish and have hypersensitive reactions to external stimuli. If upset, they are known to swim at 50km/h into nets, injuring themselves or dying on impact. Smart lighting systems were present for dusk and dawn simulation to reduce stress of the tuna, and Lassgard Bioteknik spent ¥4.2 million on revising these systems, as their inefficacy was believed to be responsible for the tuna’s unusual behaviour.
When the tuna then began dying off after the erratic behaviour progressed unabated, it was believed that the culprit was actually a parasitic encephalitis caused by Miamiensis avidus.  A 1997 study of this waterborne parasite had shown that it causes atypical swimming behaviour followed by rapid death in southern bluefin tuna, which prompted Lassgard Bioteknik to install additional disinfection and filtration systems after increased site fallowing between farming cycles.
This strategy also proved ineffective at curbing the tuna mortalities, which led to reduced production quotas and a concurrent drop in Lassgard Bioteknik’s share price in late 2037. Ultimately, the decision was made to outfit all Lassgard tuna farms with smart cameras that made use of algorithms to track individual fish and accurately detect the behavioural anomalies that preindicated increased suicidal tendencies and death.  Since it took approximately two to three years for Lassgard tuna to reach market size and the anomalies only started appearing after two years, Lassgard Bioteknik began processing and shipping its tuna as soon as the algorithms signalled the ideal window between adequate growth size and onset of symptoms.
All Lassgard tuna were screened and biopsied before transfer, but the only tests in place for prions were configured to check for vacuolisation of the brain tissue and zones of spongiosis. These clinical signs are apparent with most prion diseases, including BSE, but the species transmission from cattle to fish had altered BSE’s pathogenesis so that the fish brains exhibited no vacuole formation or spongiosis. As a result, a prion infection was never considered as a causative agent.
The issue was considered resolved and would not be revisited until January 2039, when Lassgard Bioteknik was contacted by the GFN about a possible contaminant in its tuna that was responsible for an increased mortality rate in cats and at least one human casualty. The leaked data reflected that correspondence between CEO Lassgard, his lawyers, and several other Big Fish companies peaked at this point, resulting in an agreement to jointly protect Lassgard Bioteknik while it internally dealt with the PTAE epizootic. This involved starting a new tuna farming cycle with one of the older feed stocks that did not include bovine waste material and severing ties with its suppliers in the meat packing industry. There were also plans for a significant restructuring and rebranding effort when the WNW articles were published in October 2039, which caused an international outcry.
Lassgard Bioteknik’s share price plummeted when the WHO declared the outbreak of Cariappa-Muren disease (CMD) a pandemic on October 25th 2039 and successfully banned the sale of Lassgard tuna. At the same time, multiple lawsuits and class actions were filed against CEO Lassgard’s person by different governments and consumer organisations, which were funnelled into joint proceedings through the EU’s collective redress policy. Lassgard became the public target of this legal campaign because, while Lassgard Bioteknik was subjected to a number of corporate fines, no criminal charges could be brought against the company. According to Swedish law, a company cannot be liable to a criminal sanction, and the use of PAP pellets was permitted under EU regulations.
On October 29th 2039, CEO Lassgard disappeared, leaving Lassgard Bioteknik’s chair Nils Törbacka to handle the backlash. Törbacka immediately issued a statement in which he condemned the data leak as a “massive forgery” and dismissed the role of Lassgard tuna in the CMD pandemic as “at most, a contributing factor.”  The statement was widely ridiculed, but Törbacka doubled down and refused to cooperate with Swedish and international authorities. After he ignored an order from the WHO to shut down Lassgard Bioteknik’s facilities in Europe and East Asia, many of which had already suffered employee walkouts, the Swedish Financial Supervisory Authority (FSA) concluded Lassgard Bioteknik was so fraught with problems that it had to be seized.
On November 4th 2039, the FSA appointed a liquidator and coordinated with international regulators to simultaneously lock down Lassgard Bioteknik’s offices and aquaculture farms. Törbacka and other senior officials were arrested by Swedish police when the company’s head office in Uppsala was raided, which revealed that Törbacka had been stalling authorities in order to sell off Lassgard Bioteknik’s remaining tuna stock to willing illicit market buyers.
This paved the way for Lassgard Bioteknik’s formal liquidation in the winter of 2039. All company assets were forfeited to pay out creditors and cover legal costs, though with the aquaculture industry as a whole facing widespread criticism and insolvency, most of Lassgard Bioteknik’s fish farming facilities were dismantled rather than sold off. Major litigation ended when the liquidation process was completed on February 4th 2040, but regular suits and legal actions related to the food poisoning scandal are still being brought.
Although the WHO investigation ultimately established that Lassgard Bioteknik had only used the contaminated PAP pellets to grow its tuna stock from 2031 onward, the GFN moved to have the company’s entire fish and feed stock destroyed. Preservation efforts to release the noninfected fish species into the wild were unsuccessful, and when the ordered destruction was wrapped up by March 2040, over 240,000 tonnes of fish had been slaughtered, with all carcasses chemically treated to safely break down any residual prions.
- William Lassgard
- Lassgard tuna
- Cariappa-Muren disease
- Piscine transmissible amyloidotic encephalopathy
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